Method for Transmitting Uplink Control Information and Apparatus

ABSTRACT

Embodiments of the present invention provide a method for transmitting uplink control information and an apparatus, applicable to a multi-carrier system. A user terminal receives physical layer signaling from a network device, where the physical layer signaling includes first indication information. The user terminal determines, according to the first indication information, a bit quantity of periodic CSI that can be sent on a channel resource or a piece quantity of periodic CSI that can be sent on a channel resource. The user terminal determines, according to the bit quantity or the piece quantity of the periodic CSI that can be sent, to-be-sent periodic CSI from periodic CSI corresponding to multiple downlink carriers. The user terminal sends HARQ-ACK information and the to-be-sent periodic CSI on the channel resource.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.15/896,560, filed Feb. 14, 2018, which is a continuation ofInternational Application No. PCT/CN2015/087095, filed on Aug. 14, 2015,the disclosure of which is hereby incorporated by reference in itsentirety.

TECHNICAL FIELD

This application relates to the wireless communications field, and inparticular, to a method for transmitting uplink control information andan apparatus.

BACKGROUND

Wireless communications technologies have developed to a Long TermEvolution (LTE) system. To better improve a data rate of user equipment(UE), the LTE system can support a carrier aggregation (CA) technology.The CA technology mainly means configuring multiple carriers for one UE,to improve a data rate of the UE. A base station using the CA technologysynchronously transmits data or a control signal on the multiplecarriers. Correspondingly, the UE detects a physical downlink controlchannel (PDCCH) of each carrier and a corresponding physical downlinkshared channel (PDSCH), and receives data on a downlink data channel orsends data on an uplink data channel.

The base station that supports the CA technology synchronously transmitsdata on the multiple carriers. Therefore, correspondingly, the UE thatsupports the CA technology may simultaneously detect downlink data onmultiple downlink carriers. Because the LTE system uses a hybridautomatic repeat request (HARQ) mechanism, the UE needs tosimultaneously provide a HARQ feedback for the downlink data on themultiple downlink carriers. With reference to a hybrid automatic repeatrequest-acknowledgment (HARQ-ACK) feedback requirement in the HARQmechanism, the UE needs to feed back, on one channel, HARQ-ACKinformation of the downlink data on the multiple downlink carriers. TheHARQ-ACK information may include acknowledgement (ACK) information andnegative acknowledgement (NACK) information, and may further include DTXinformation.

In another aspect, in order that the base station can schedule the UE onthe multiple downlink carriers and transmit downlink data, the UE needsto feed back channel state information (CSI) of each carrier to the basestation. CSI reporting is classified into periodic CSI reporting andaperiodic CSI reporting. The periodic CSI reporting is usuallyimplemented using a physical uplink control channel (PUCCH). The basestation configures parameters of periodic CSI reporting for eachdownlink carrier using higher layer signaling. These parameters mayinclude a reporting period, a reporting subframe offset, a used PUCCHresource, a reporting mode, and the like of periodic CSI. According tothe reporting period, the reporting subframe offset, the used PUCCHresource, the reporting mode, and the like, of the periodic CSI that areconfigured for each carrier, the UE may determine a bit quantity andreported content of periodic CSI reporting performed in a reportingsubframe for each carrier.

It can be learned that, for the multiple carriers, the UE may need tosimultaneously feed back the HARQ-ACK information for the downlink datacarried on these carriers and the periodic CSI of the carriers to thebase station in one uplink subframe. The HARQ-ACK information and theperiodic CSI may be collectively referred to as uplink controlinformation (UCI).

The PUCCH has a relatively small capacity, and the HARQ-ACK informationis more important than the periodic CSI. Therefore, when the HARQ-ACKinformation and the periodic CSI are transmitted simultaneously on aresource of the PUCCH, the UE needs to preferentially ensure performanceof transmitting the HARQ-ACK information by the UE. In current carrieraggregation supporting five carriers, to ensure transmission performanceof HARQ-ACK information, the UE can feed back periodic CSI of a maximumof one carrier in one uplink subframe. Apparently, the foregoing mannerresults in lack of periodic CSI of other carriers, and affects accuracyin scheduling the UE by the base station on the multiple carriers.

As the LTE technology further evolves, carrier aggregation of morecarriers, for example, carrier aggregation of 32 carriers, may beintroduced into the CA technology. In this case, if the UE can stillfeed back periodic CSI of a maximum of one carrier in one uplinksubframe, accuracy in scheduling the UE by the base station on themultiple carriers is severely affected. Therefore, in this case, ahigher-capacity PUCCH format needs to be introduced to send UCIinformation. Therefore, the UE needs to simultaneously transmit HARQ-ACKinformation and periodic CSI of the multiple carriers in one uplinksubframe on a resource of the higher-capacity PUCCH format.

As described above, the HARQ-ACK information is more important than theperiodic CSI. Therefore, when the HARQ-ACK information and multiplepieces of periodic CSI are transmitted simultaneously on the resource ofthe PUCCH, transmission performance of the HARQ-ACK information needs tobe ensured. In this case, currently, there is still no specificimplementation solution to ensure the transmission performance of theHARQ-ACK information and to send as much periodic CSI as possible.

SUMMARY

Embodiments of the present invention provide a method for transmittinguplink control information and an apparatus, so that transmissionperformance of HARQ-ACK information can be ensured, and as much periodicCSI as possible can be sent.

According to one aspect, an embodiment of the present invention providesa method for sending uplink control information. A user terminal sendsHARQ-ACK information and periodic CSI using a channel resource. Acarrier corresponding to the HARQ-ACK information and the periodic CSIbelongs to multiple downlink carriers. The method includes receiving, bythe user terminal by using at least one of the multiple downlinkcarriers, downlink data transmitted by a network device. The method alsoincludes receiving, by the user terminal, physical layer signaling fromthe network device. The physical layer signaling includes firstindication information, and the first indication information includesone or any combination of the following: bit quantity information of theperiodic CSI, piece quantity information of the periodic CSI, encodingbit rate information of the HARQ-ACK information, information about aquantity of resources that need to be occupied by the HARQ-ACKinformation, maximum bit quantity information of UCI information thatcan be transmitted on the channel resource, or an identifier of thechannel resource. The method also includes determining, by the userterminal according to the first indication information, a bit quantityof periodic CSI that can be sent on the channel resource or a piecequantity of periodic CSI that can be sent on the channel resource. Themethod also includes determining, by the user terminal according to thebit quantity or the piece quantity of the periodic CSI that can be sent,to-be-sent periodic CSI from periodic CSI corresponding to the multipledownlink carriers. The method also includes sending, by the userterminal, the HARQ-ACK information and the to-be-sent periodic CSI onthe channel resource.

Optionally, there are at least two channel resources that can be used bythe user terminal to send the HARQ-ACK information and the periodic CSI.The channel resource used by the user terminal to send the HARQ-ACKinformation and the periodic CSI is selected for the user terminal bythe network device from the at least two channel resources. The firstindication information includes the identifier of the channel resource.The determining, by the user terminal according to the first indicationinformation, a bit quantity of periodic CSI that can be sent on thechannel resource includes: determining, by the user terminal accordingto the identifier and a specified correspondence between a channelresource identifier and second indication information, second indicationinformation corresponding to the identifier, where the second indicationinformation includes one or any combination of the following: the bitquantity information of the periodic CSI, the piece quantity informationof the periodic CSI, the encoding bit rate information of the HARQ-ACKinformation, the information about the quantity of resources that needto be occupied by the HARQ-ACK information, or the maximum bit quantityinformation of the UCI information that can be transmitted on thechannel resource; and determining, by the user terminal according to thesecond indication information, the bit quantity of the periodic CSI thatcan be sent on the channel resource.

Optionally, the correspondence includes a correspondence between anidentifier of each channel resource and second indication information ofthe corresponding channel resource, or includes a correspondence betweenthe identifier of the channel resource and the second indicationinformation. The channel resources that can be used to send the HARQ-ACKinformation and the periodic CSI include two or more channel resourcesof different formats and/or two or more channel resources of a sameformat, where the channel resources of the same format correspond todifferent second indication information.

According to another aspect, an embodiment of the present inventionprovides a user terminal. The user terminal sends HARQ-ACK informationand periodic CSI using a channel resource. A carrier corresponding tothe HARQ-ACK information and the periodic CSI belongs to multipledownlink carriers. The user terminal includes a receiving unit,configured to receive, using at least one of the multiple downlinkcarriers, downlink data transmitted by a network device, and receivephysical layer signaling from the network device. First indicationinformation included in the physical layer signaling includes one or anycombination of the following: bit quantity information of the periodicCSI, piece quantity information of the periodic CSI, encoding bit rateinformation of the HARQ-ACK information, information about a quantity ofresources that need to be occupied by the HARQ-ACK information, maximumbit quantity information of UCI information that can be transmitted onthe channel resource, or an identifier of the channel resource. The userterminal also includes a processing unit, configured to determine,according to the first indication information received by the receivingunit, a bit quantity or a piece quantity of periodic CSI that can besent on the channel resource; and determine, according to the bitquantity or the piece quantity of the periodic CSI that can be sent onthe channel resource, to-be-sent periodic CSI from periodic CSIcorresponding to the multiple downlink carriers. The user terminal alsoincludes a sending unit, configured to send, on the channel resource,the HARQ-ACK information and the to-be-sent periodic CSI that isdetermined by the processing unit.

Optionally, there are at least two channel resources that can be used bythe user terminal to send the HARQ-ACK information and the periodic CSI.The channel resource used by the user terminal to send the HARQ-ACKinformation and the periodic CSI is selected for the user terminal bythe network device from the at least two channel resources. The firstindication information includes the identifier of the channel resource.The processing unit being configured to determine, according to thefirst indication information, a bit quantity of periodic CSI that can besent on the channel resource includes the processor being configured to:determine, according to the identifier and a specified correspondencebetween a channel resource identifier and second indication information,second indication information corresponding to the identifier, where thesecond indication information includes one or any combination of thefollowing: the bit quantity information of the periodic CSI, the piecequantity information of the periodic CSI, the encoding bit rateinformation of the HARQ-ACK information, the information about thequantity of resources that need to be occupied by the HARQ-ACKinformation, or the maximum bit quantity information of the UCIinformation that can be transmitted on the channel resource; anddetermine, according to the second indication information, the bitquantity of the periodic CSI that can be sent on the channel resource.

Optionally, the correspondence includes a correspondence between anidentifier of each channel resource and second indication information ofthe corresponding channel resource, or includes a correspondence betweenthe identifier of the channel resource and the second indicationinformation. The channel resources that can be used to send the HARQ-ACKinformation and the periodic CSI include two or more channel resourcesof different formats and/or two or more channel resources of a sameformat, where the channel resources of the same format correspond todifferent second indication information.

According to still another aspect, an embodiment of the presentinvention provides a method for receiving uplink control information. Auser terminal sends HARQ-ACK information and periodic CSI by using achannel resource. A carrier corresponding to the HARQ-ACK informationand the periodic CSI belongs to multiple downlink carriers. The methodincludes transmitting, by a network device, downlink data to the userterminal using at least one of the multiple downlink carriers. Themethod also includes determining, by the network device, indicationinformation, and sending the indication information to the user terminalusing physical layer signaling. The indication information includes oneor any combination of the following: bit quantity information of theperiodic CSI, piece quantity information of the periodic CSI, encodingbit rate information of the HARQ-ACK information, information about aquantity of resources that need to be occupied by the HARQ-ACKinformation, maximum bit quantity information of UCI information thatcan be transmitted on the channel resource, or an identifier of thechannel resource. The method also includes receiving, by the networkdevice on the channel resource, the periodic CSI and the HARQ-ACKinformation that are reported by the user terminal.

According to yet another aspect, an embodiment of the present inventionprovides a network device, applicable to a wireless communicationssystem that includes a user terminal. The user terminal sends HARQ-ACKinformation and periodic CSI using a channel resource. A carriercorresponding to the HARQ-ACK information and the periodic CSI belongsto multiple downlink carriers. The network device includes a sendingunit, configured to: transmit downlink data to the user terminal byusing at least one of the multiple downlink carriers, and send physicallayer signaling to the user terminal, where the physical layer signalingincludes indication information determined by a processing unit. Thenetwork device also includes the processing unit, configured todetermine the indication information. The indication informationincludes one or any combination of the following: bit quantityinformation of the periodic CSI, piece quantity information of theperiodic CSI, encoding bit rate information of the HARQ-ACK information,information about a quantity of resources that need to be occupied bythe HARQ-ACK information, maximum bit quantity information of UCIinformation that can be transmitted on the channel resource, or anidentifier of the channel resource. The network device also includes areceiving unit, configured to receive the periodic CSI and the HARQ-ACKinformation that are reported by the user terminal.

According to the embodiments of the present invention, before sendingthe HARQ-ACK information and the periodic CSI, the user terminalreceives the first indication information by using the physical layersignaling, and thereby can obtain indication information that isdynamically determined for the user terminal by the network device. Theuser terminal determines, according to the first indication information,the bit quantity or the piece quantity of the periodic CSI that can besent on the channel resource, and thereby can determine CSI that can besent in periodic CSI that needs to be fed back in a current subframe fora carrier of the multiple downlink carriers. In this way, when theHARQ-ACK information and the periodic CSI of the multiple downlinkcarriers are sent simultaneously, on the premise that transmissionperformance of the HARQ-ACK information is ensured, and as much periodicCSI as possible can be sent, so that a problem that accuracy inscheduling the user terminal by a base station is affected because theuser terminal cannot report the periodic CSI of all the downlinkcarriers is avoided to the greatest extent possible.

BRIEF DESCRIPTION OF THE DRAWINGS

To describe the technical solutions in the embodiments of the presentinvention more clearly, the following briefly describes the accompanyingdrawings required for describing the embodiments. Apparently, theaccompanying drawings in the following description show merely someembodiments of the present invention, and a person of ordinary skill inthe art may still derive other drawings from these accompanying drawingswithout creative efforts.

FIG. 1 is a flowchart of a method according to an embodiment of thepresent invention;

FIG. 2 is a schematic structural diagram of a user terminal according toan embodiment of the present invention; and

FIG. 3 is a schematic structural diagram of a network device accordingto an embodiment of the present invention.

DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS

Although an LTE system is used as an example for description in theBACKGROUND section, a person skilled in the art shall understand thatthe present invention is not only applicable to the LTE system, but alsoapplicable to another wireless communications system, for example, a GSMsystem, a UMTS system, a CDMA system, or a new network system. Thefollowing describes specific embodiments by using the LTE system as anexample.

In the embodiments of the present invention, a user terminal may be userequipment, or may be a similar device such as a handheld terminal. Anetwork device may be a base station such as an eNodeB, or may be asimilar network device. This is not limited in the embodiments of thepresent invention. The user terminal and the network device may beincluded in the foregoing various wireless communications systems.

In a current system, a quantity of resources that need to be occupied byHARQ-ACK information is constant, and a quantity of PUCCH channelresources is also constant. Therefore, a user terminal may determine,according to the quantity of PUCCH channel resources and the quantity ofresources that need to be occupied by the HARQ-ACK information, whethera quantity of remaining resources is sufficient for feeding backperiodic CSI, to determine whether the HARQ-ACK information and theperiodic CSI can be fed back simultaneously. If the quantity ofremaining resources is insufficient for feeding back the periodic CSI,the periodic CSI is not fed back.

For example, when there is a relatively small quantity of carriers incarrier aggregation, for example, when there are no more than fivecarriers, a quantity of resources occupied by the HARQ-ACK informationin a PUCCH may be set to a constant resource quantity. The constantresource quantity is greater than a resource quantity that is requiredin the PUCCH under the worst channel condition when transmissionperformance of the HARQ-ACK just meets a requirement. When there is arelatively small quantity of carriers, a resource quantity varies littleunder the best channel condition and under the worst channel condition.Therefore, the constant resource quantity of the PUCCH may be used tosend the HARQ-ACK, to meet requirements for transmission performance ofthe HARQ-ACK under various channel conditions, without wasting manyresources. Moreover, because there is a relatively small quantity ofcarriers, periodic CSI of only one carrier or even no periodic CSI canbe sent on the PUCCH. Downlink data scheduling is little affected inboth cases.

When the PUCCH can support sending HARQ-ACK of more downlink carrierdata and CSI of more downlink carriers, downlink data scheduling isgreatly affected if to-be-sent periodic CSI is dropped. To drop lessto-be-sent periodic CSI, fewest resources possible in the resources ofthe PUCCH should be used to send the HARQ-ACK information. Therefore, itis usually not the case like the current system in which the constantresource quantity is used in the PUCCH to transmit the HARQ-ACKinformation, to meet the requirements for the transmission performanceof the HARQ-ACK under the various channel conditions, withoutconsideration of a resource waste caused by configuration of theconstant resource quantity. For example, when a channel conditionchanges, or the like, to ensure that transmission performance of theHARQ-ACK information meets a requirement, a quantity of resources thatneed to be occupied by the HARQ-ACK information is usually inconstant,and may vary greatly. Therefore, according to the solution in thecurrent system, there is no way for UE to ensure the transmissionperformance of the HARQ-ACK information and send as much periodic CSI aspossible.

In view of this, in solutions of the embodiments of the presentinvention, when the UE simultaneously transmits the HARQ-ACK informationand the periodic CSI, the transmission performance of the HARQ-ACKinformation needs to be ensured, and as much periodic CSI as possibleneeds to be sent.

When the conditions of the PUCCH support sending the HARQ-ACK of moredownlink carrier data and the CSI of more downlink carriers, the UE mayencode the HARQ-ACK information using convolutional coding or the like,and a base station may adjust an encoding bit rate of the HARQ-ACKinformation. As such, the HARQ-ACK information reported by the UE canadapt to a change of the channel condition. Further, transmissionperformance of the HARQ-ACK information is ensured. In view of thiscase, the embodiments of the present invention provide the followingsolutions, so that as much periodic CSI as possible can be sent on thepremise that the transmission performance of the HARQ-ACK information isensured.

The following describes various possible implementations in specificembodiments with reference to the accompanying drawings.

In an embodiment of the present invention, mainly, a network devicesends first indication information to a user terminal, and the userterminal determines, according to the first indication information, abit quantity of periodic CSI that can be transmitted. In this manner,transmission performance of HARQ-ACK information can be ensured, and asmuch periodic CSI as possible can be sent. In this embodiment, a channelresource is allocated to the user terminal, and the user terminal sendsthe HARQ-ACK information and the periodic CSI using the channelresource. A carrier corresponding to the HARQ-ACK information and theperiodic CSI belongs to multiple downlink carriers.

As shown in FIG. 1, this embodiment includes the following steps.

Step 101: The user terminal receives, using at least one of multipledownlink carriers, downlink data transmitted by the network device.

Step 102: The network device determines first indication information forthe user terminal, and sends the first indication information to theuser terminal using physical layer signaling.

The first indication information is mainly used by the user terminal todetermine a bit quantity of periodic CSI that can be sent on a channelresource. The channel resource generally includes a PUCCH. The firstindication information may include one or any combination of thefollowing: bit quantity information of the periodic CSI, piece quantityinformation of the periodic CSI, encoding bit rate information ofHARQ-ACK information, information about a quantity of resources thatneed to be occupied by the HARQ-ACK information, maximum bit quantityinformation of UCI information that can be transmitted on the channelresource, or an identifier of the channel resource.

The bit quantity information of the periodic CSI may represent the bitquantity of the periodic CSI that can be sent on the channel resource.The representation may be an explicit representation or may be arepresentation using a correspondence. For example, identifiers may beset to correspond to different bit quantities. “Represent” mentionedbelow is similar, and is not illustrated.

The piece quantity information of the periodic CSI may represent a piecequantity of the periodic CSI that can be sent on the channel resource.One piece of periodic CSI corresponds to periodic CSI of one carrier orperiodic CSI of one process.

The encoding bit rate information of the HARQ-ACK information mayrepresent an encoding bit rate of the HARQ-ACK information.

The information about the quantity of resources that need to be occupiedby the HARQ-ACK information may represent the quantity of resources thatneed to be occupied by the HARQ-ACK information.

The maximum bit quantity information of the UCI information that can betransmitted on the channel resource may represent a maximum bit quantityof the UCI information that can be transmitted on the channel resource.

The first indication information is determined for the user terminal. Inother words, the first indication information is indication informationspecific to the user terminal.

The first indication information may be sent to the user terminal usinga physical downlink control channel (PDCCH) or an enhanced physicaldownlink control channel (EPDCCH).

Step 103: The user terminal determines, according to the firstindication information, a bit quantity or a piece quantity of periodicCSI that can be sent on a channel resource.

The bit quantity of the periodic CSI that can be sent on the channelresource is a bit quantity of periodic CSI that can be sent on thepremise that the channel resource meets transmission of the HARQ-ACKinformation. The bit quantity is usually less than or equal to a bitquantity of periodic CSI that needs to be fed back for the multipledownlink carriers. The bit quantity of the periodic CSI that needs to befed back may be a bit quantity of periodic CSI that needs to be fed backin a current subframe for an active-state carrier in the multipledownlink carriers.

The piece quantity of the periodic CSI that can be sent on the channelresource may be a piece quantity of the periodic CSI that can be sent onthe premise that the channel resource meets the requirement for thetransmission of the HARQ-ACK information. The piece quantity is usuallyless than or equal to a piece quantity of the periodic CSI that needs tobe fed back for the multiple downlink carriers. The piece quantity ofthe periodic CSI that needs to be fed back may be a piece quantity ofthe periodic CSI that needs to be fed back in the current subframe forthe active-state carrier in the multiple downlink carriers. One piece ofperiodic CSI corresponds to periodic CSI of one carrier or periodic CSIof one process.

The network device may send, to the user terminal using the physicallayer signaling, the first indication information that is dynamicallydetermined for the user terminal, so that the user terminal can learnthe bit quantity of the periodic CSI that can be currently sent on thechannel resource. It can be learned that because the first indicationinformation is dynamically determined for the user terminal by thenetwork device. The first indication information may be different or maybe the same under different circumstances. Correspondingly, bitquantities determined by the user terminal according to the firstindication information may usually be different, but may be the same insome cases.

The bit quantity or the piece quantity that is determined in step 103and that is of the periodic CSI that can be sent on the channel resourcemay be understood as a bit quantity or a piece quantity of periodic CSIcapable of being sent on the channel resource.

Moreover, in this embodiment of the present invention, the networkdevice sends the first indication information to the user terminal instep 102. Alternatively, the user terminal may obtain the firstindication information in another manner. For example, the user terminalstores the first indication information.

Step 104: The user terminal determines, according to the bit quantity orthe piece quantity of the periodic CSI that can be sent on the channelresource, to-be-sent periodic CSI from periodic CSI corresponding to themultiple downlink carriers, and sends HARQ-ACK information and theto-be-sent periodic CSI on the channel resource.

Before sending the HARQ-ACK information and the periodic CSI, the userterminal may encode the information according to an encoding bit rate,and then send encoded information. Correspondingly, the user terminalneeds to determine an encoding bit rate of the periodic CSI and theencoding bit rate of the HARQ-ACK information.

The HARQ-ACK information that needs to be transmitted by the userterminal may be HARQ-ACK information directly corresponding to themultiple downlink carriers, or may be HARQ-ACK information correspondingto a carrier on which data is transmitted in the multiple downlinkcarriers, or may be HARQ-ACK information of some downlink carriersconfigured for the user terminal.

The user terminal may send scheduling request (SR) information inaddition to the periodic CSI and the HARQ-ACK information. In this case,when the periodic CSI and the HARQ-ACK information corresponding to themultiple downlink carriers are sent, a quantity of bits that need to beoccupied by the SR information further needs to be considered. Thequantity of bits that need to be occupied by the SR information isusually constant, for example, 1 bit.

In addition, in the foregoing embodiment, the user terminal sendsperiodic CSI corresponding to at least one carrier, but actually, it ispossible that no periodic CSI needs to be currently fed back. In thiscase, the user terminal does not feed back periodic CSI.

In addition, if the HARQ-ACK information needs to occupy a relativelylarge quantity of resources, but a quantity of resources currentlyavailable for transmitting the UCI information is limited, the bitquantity that is determined in step 103 and that is of the periodic CSImay alternatively be only 1 bit, or even only 0 bits.

Step 105: The network device receives, on the channel resource, theperiodic CSI and the HARQ-ACK information that are reported by the userterminal.

In an embodiment, the network device may further demodulate the receivedHARQ-ACK information and periodic CSI according to the encoding bit rateof the HARQ-ACK information and the encoding bit rate of the periodicCSI.

If the encoding bit rate of the HARQ-ACK information is the same as theencoding bit rate of the periodic CSI, the network device demodulatesthe received HARQ-ACK and periodic CSI according to the encoding bitrate of the HARQ-ACK information and the encoding bit rate of theperiodic CSI. If the encoding bit rate of the HARQ-ACK information isdifferent from the encoding bit rate of the periodic CSI, the networkdevice demodulates the received HARQ-ACK and periodic CSI according tothe encoding bit rate of the HARQ-ACK information and the encoding bitrate of the periodic CSI, respectively.

By means of the foregoing processing, before sending the HARQ-ACKinformation and the periodic CSI, the user terminal receives thephysical layer signaling, and determines, according to the firstindication information in the physical layer signaling, the bit quantityof the periodic CSI that can be sent on the channel resource. The userterminal thereby can determine a bit quantity of CSI that can be sent inperiodic CSI that needs to be fed back in the current subframe for acarrier of the multiple downlink carriers. The carrier of the multipledownlink carriers may be an active-state carrier. In this way, when theHARQ-ACK information and the periodic CSI of the multiple downlinkcarriers are sent simultaneously, on the premise that transmissionperformance of the HARQ-ACK information is ensured, as much periodic CSIas possible can be sent, so that a problem that accuracy in schedulingthe user terminal by a base station is affected because the userterminal cannot report the periodic CSI of all the downlink carriers isavoided to the greatest extent possible.

The following describes some specific implementation solutions of theforegoing embodiment in detail.

In step 102, the first indication information may be any one or anycombination of multiple types of information. The following describessome cases using examples.

In a first case, the first indication information in step 102 mayinclude the bit quantity information of the periodic CSI.

In step 103, the user terminal may directly determine, according to abit quantity corresponding to the bit quantity information of theperiodic CSI, the bit quantity of the periodic CSI that can be sent onthe channel resource.

If the piece quantity of the periodic CSI that can be sent on thechannel resource is to be determined, the user terminal needs to obtain,according to the bit quantity of the periodic CSI and a configured bitquantity and a configured priority of each piece of CSI sent by the UEin the current subframe, the piece quantity of the periodic CSI that canbe sent on the channel.

For example, if the user equipment determines that the bit quantity ofthe periodic CSI that can be sent on the channel resource is K, and itis configured that a prioritized sequence of the CSI sent by the UE inthe current subframe is CSI-1, CSI-2, . . . , and CSI-N, and that bitquantities of the information CSI-1, CSI-2, . . . , and CSI-N are k₁,k₂, . . . , and k_(N) in sequence, the user equipment determines thatthe piece quantity of the periodic CSI that can be sent on the channelresource is L, where L≤N , and

${\sum\limits_{i = 1}^{L}k_{i}} \leq {K.}$

For this manner, in step 102, the network device needs to determine thebit quantity corresponding to the bit quantity information. It may beunderstood that if the bit quantity information is not the bit quantity,before the bit quantity information is determined, the bit quantityneeds to be first determined. The following cases in which the networkdevice determines the first indication information are also similar tothis manner.

The encoding bit rate of the HARQ-ACK information and the encoding bitrate of the periodic CSI may be the same or may be different. Therefore,the following separately describes the two cases.

If the encoding bit rate of the HARQ-ACK information is the same as theencoding bit rate of the periodic CSI, the bit quantity of the periodicCSI that can be sent on the channel resource needs to meet thefollowing: A sum of the bit quantity of the periodic CSI that can besent on the channel resource and an original bit quantity of theHARQ-ACK information is less than or equal to the maximum bit quantityof the UCI information that can be transmitted on the channel resource.Because the encoding bit rate of the HARQ-ACK information is the same asthe encoding bit rate of the periodic CSI, the maximum bit quantity ofthe UCI information that can be transmitted on the channel resourcecorresponds to a total quantity of the channel resource, the encodingbit rate of the HARQ-ACK information, and the encoding bit rate of theperiodic CSI.

For this case, during specific implementation, the network device mayfirst determine the encoding bit rate of the HARQ-ACK information andthe encoding bit rate of the periodic CSI according to a target receivedbit error rate of the HARQ-ACK information and a channel condition. Thechannel condition may be information such as a signal to interferenceplus noise ratio. Then, the network device may determine, according tothe total resource quantity of the channel resource and the encoding bitrates, the maximum bit quantity of the UCI information that can betransmitted on the channel resource. Then, the network device maysubtract the original bit quantity of the HARQ-ACK information from themaximum bit quantity, to obtain the bit quantity of the periodic CSIthat can be sent on the channel resource.

If the encoding bit rate of the HARQ-ACK information is different fromthe encoding bit rate of the periodic CSI, the bit quantity of theperiodic CSI that can be sent on the channel resource corresponds to aquantity of resources that can be occupied by the periodic CSI and theencoding bit rate of the periodic CSI. If the encoding bit rate of theHARQ-ACK information is different from the encoding bit rate of theperiodic CSI, the quantity of resources that can be occupied by theperiodic CSI is less than or equal to a difference between a totalquantity of the channel resource and a quantity of resources occupied bythe HARQ-ACK information. The quantity of resources occupied by theHARQ-ACK information corresponds to the encoding bit rate of theHARQ-ACK information and an original bit quantity of the HARQ-ACKinformation.

For this case, during specific implementation, the network device maydetermine the encoding bit rate of the HARQ-ACK information using theforegoing method. The network device may further determine, according tothe original bit quantity of the HARQ-ACK information, the quantity ofresources occupied by the HARQ-ACK information. The network device maythen subtract the quantity of resources occupied by the HARQ-ACKinformation from the total resource quantity of the channel resource, toobtain the quantity of resources that can be occupied by the periodicCSI. The network device may then determine the encoding bit rate of theperiodic CSI according to a preset difference between the encoding bitrate of the HARQ-ACK and the encoding bit rate of the periodic CSI,where the preset difference may be preconfigured, or may be notified tothe user terminal by the network device. The network device may thenfinally obtain, according to the encoding bit rate of the periodic CSIand the quantity of resources that can be occupied by the periodic CSI,the bit quantity of the periodic CSI that can be sent on the channelresource.

The target received bit error rate is a bit error rate obtained by thenetwork device by demodulating the HARQ-ACK information after theHARQ-ACK information is sent to the network device, and the encoding bitrate is determined according to the target received bit error rate andthe channel condition. Therefore, when allocation of the resourcequantity in the channel resource is determined using the encoding bitrate, the transmission performance of the HARQ-ACK information can beensured.

In step 103, the user terminal may further determine the encoding bitrate of the periodic CSI and the encoding bit rate of the HARQ-ACKinformation according to the bit quantity corresponding to the bitquantity information of the periodic CSI. There are also two casesaccording to whether the encoding bit rates are the same or different.

If the encoding bit rate of the HARQ-ACK information is the same as theencoding bit rate of the periodic CSI, the determined encoding bit rateof the HARQ-ACK information should correspond to the maximum bitquantity of the UCI information that can be transmitted on the channelresource and the total resource quantity of the channel resource, andthe maximum bit quantity of the UCI information that can be transmittedon the channel resource is greater than or equal to a sum of theoriginal bit quantity of the HARQ-ACK information and the bit quantityof the periodic CSI that can be sent on the channel resource.

For this case, during specific implementation, the user terminal maydetermine, according to the original bit quantity of the HARQ-ACKinformation and the bit quantity of the periodic CSI that can be sent onthe channel resource, the maximum bit quantity of the UCI informationthat can be transmitted on the channel resource. The user terminal maythen determine the encoding bit rate of the HARQ-ACK information and theencoding bit rate of the periodic CSI according to the maximum bitquantity and the total resource quantity of the channel resource.

If the encoding bit rate of the HARQ-ACK information is different fromthe encoding bit rate of the periodic CSI, the encoding bit rate of theperiodic CSI and the encoding bit rate of the HARQ-ACK information needto meet the following formulas:

P _(ACK)*N _(ACK)+(P _(ACK)+Δ)*N _(CSI) =Q   (Formula 1),

and

P _(CSI) =P _(ACK)+Δ  (Formula 2),

where

P_(ACK) is the encoding bit rate of the HARQ-ACK information, P_(CSI)isthe encoding bit rate of the periodic CSI, N_(ACK) is the original bitquantity of the HARQ-ACK information, N_(CSI) is the bit quantity of theperiodic CSI that can be sent on the channel resource, Q is the totalresource quantity of the channel resource, and Δ is the differencebetween the encoding bit rate of the HARQ-ACK information and theencoding bit rate of the periodic CSI.

For this case, during specific implementation, the user terminal maydetermine the encoding bit rate P_(ACK) of the HARQ-ACK informationusing the foregoing formula 1 and according to the original bit quantityN_(ACK) of the HARQ-ACK information, the bit quantity N_(CSI) of theperiodic CSI that can be sent on the channel resource, the presetdifference Δ between the encoding bit rate of the HARQ-ACK informationand the encoding bit rate of the periodic CSI, and the total resourcequantity Q of the channel resource. The user terminal may furtherdetermine the encoding bit rate of the periodic CSI by using theforegoing formula 2 and according to the encoding bit rate P_(ACK) ofthe HARQ-ACK information and the difference Δ.

In a second case, the first indication information in step 102 mayinclude the piece quantity information of the periodic CSI.

For this case, in step 102, the network device may determine the piecequantity of the periodic CSI according to the bit quantity of theperiodic CSI on the basis of the foregoing first case.

For example, the network device may obtain, according to the bitquantity of the periodic CSI and a configured bit quantity and aconfigured priority of each piece of CSI sent by the UE in the currentsubframe, the piece quantity of the periodic CSI that can be sent on thechannel. For example, if the network device determines that the bitquantity of the periodic CSI that can be sent is K, and it is configuredthat a prioritized sequence of the CSI sent by the UE in the currentsubframe is CSI-i, CSI-2, . . . , and CSI-N, and that bit quantities ofthe information CSI-1, CSI-2, . . . , and CSI-N are k₁, k₂, . . . , andk_(N) in sequence, the network-side device determines that the piecequantity of the periodic CSI that can be sent on the channel resource isL, where L≤N, and

${\sum\limits_{i = 1}^{L}k_{i}} \leq {K.}$

Correspondingly, in step 103, the user terminal needs to determine thebit quantity of the periodic CSI according to the piece quantityinformation.

The user terminal may determine, according to the piece quantity of theCSI that can be sent on the channel resource and the bit quantity andthe priority of each piece of CSI sent by the user terminal in thecurrent subframe, the bit quantity of the periodic CSI that can be sentby the user terminal on the channel resource. For example, if the piecequantity that is determined by the user terminal and that is of theperiodic CSI that can be sent is L, the prioritized sequence of the CSIsent by the user terminal in the current subframe is CSI-1, CSI-2, . . ., and CSI-N, and the bit quantities of the information CSI-1, CSI-2, . .. , and CSI-N are k₁, k₂, . . . and k_(N) in sequence, the user terminaldetermines that the bit quantity of the periodic CSI that can be sent

on the channel resource is L, where

$L = {\sum\limits_{i = 1}^{L}{k_{i}.}}$

If the user terminal further needs to determine the encoding bit rate ofthe periodic CSI and the encoding bit rate of the HARQ-ACK information,for a specific determining method, refer to the method in the foregoingfirst case. Details are not described herein again.

In a third case, the first indication information in step 102 mayinclude the encoding bit rate information of the HARQ-ACK information.

For this manner, in step 102, the network device needs to firstdetermine an encoding bit rate corresponding to the encoding bit rateinformation. The encoding bit rate of the HARQ-ACK informationcorresponds to a target received bit error rate of the HARQ-ACKinformation and a channel condition. During specific implementation, asdescribed in the first case, the network device may determine theencoding bit rate of the HARQ-ACK information according to the targetreceived bit error rate of the HARQ-ACK information and the channelcondition.

The network device usually further needs to determine the encoding bitrate of the periodic CSI. If the two encoding bit rates are the same,the encoding bit rate of the HARQ-ACK information is directly used asthe encoding bit rate of the periodic CSI. If the encoding bit rates aredifferent, the network device may determine the encoding bit rate of theperiodic CSI according to the encoding bit rate of the HARQ-ACKinformation and a preset difference between the encoding bit rate of theHARQ-ACK information and the encoding bit rate of the periodic CSI.

Correspondingly, in step 103, the user terminal needs to determine,according to the encoding bit rate corresponding to the encoding bitrate information of the HARQ-ACK information, the bit quantity or thepiece quantity of the periodic CSI that can be sent on the channelresource.

A solution to determining the bit quantity is first described. Accordingto whether the encoding bit rate of the HARQ-ACK information is the sameas or different from the encoding bit rate of the periodic CSI, thereare two cases in which the user terminal determines the bit quantity ofthe periodic CSI that can be sent on the channel resource.

If the encoding bit rate of the HARQ-ACK information is the same as theencoding bit rate of the periodic CSI, the bit quantity of the periodicCSI that can be sent on the channel resource is less than or equal to adifference between the maximum bit quantity of the UCI information thatcan be transmitted on the channel resource and an original bit quantityof the HARQ-ACK information, and the maximum bit quantity of the UCIinformation that can be transmitted on the channel resource correspondsto the encoding bit rate of the HARQ-ACK information and a totalresource quantity of the channel resource.

For this case, during specific implementation, the user terminal maydetermine, according to the encoding bit rates and the total resourcequantity of the channel resource, the maximum bit quantity of the UCIinformation that can be transmitted on the channel resource; and thenobtain, according to the original bit quantity of the HARQ-ACKinformation, the bit quantity of the periodic CSI that can be sent onthe channel resource. The encoding bit rate of the HARQ-ACK informationand the encoding bit rate of the periodic CSI can be directlydetermined.

If the encoding bit rate of the HARQ-ACK information is different fromthe encoding bit rate of the periodic CSI, the bit quantity of theperiodic CSI that can be sent on the channel resource corresponds to theencoding bit rate of the periodic CSI and a quantity of resources thatcan be occupied by the periodic CSI, the encoding bit rate of theperiodic CSI is equal to a sum of the encoding bit rate of the HARQ-ACKinformation and the difference between the encoding bit rate of theHARQ-ACK information and the encoding bit rate of the periodic CSI, thequantity of resources that can be occupied by the periodic CSI is lessthan or equal to a difference between a total resource quantity of thechannel resource and a quantity of resources occupied by the HARQ-ACKinformation, and the quantity of resources occupied by the HARQ-ACKinformation corresponds to the encoding bit rate of the HARQ-ACKinformation and an original bit quantity of the HARQ-ACK information.

For this case, during specific implementation, the user terminal mayobtain, according to the encoding bit rates and the original bitquantity of the HARQ-ACK information, the quantity of resources occupiedby the HARQ-ACK information. The user terminal may then subtract thequantity of resources occupied by the HARQ-ACK information from thetotal resource quantity of the channel resource, to obtain the quantityof resources that can be occupied by the periodic CSI. The user terminalmay then determine the encoding bit rate of the periodic CSI accordingto the preset difference between the encoding bit rate of the HARQ-ACKand the encoding bit rate of the periodic CSI, where the presetdifference may be preconfigured, or may be notified to the user terminalby the network device. The user terminal may finally obtain, accordingto the encoding bit rate of the periodic CSI and the quantity ofresources that can be occupied by the periodic CSI, the bit quantity ofthe periodic CSI that can be sent on the channel resource.

It can be learned that, using the foregoing process, the user equipmentcan already determine the encoding bit rate of the HARQ-ACK informationand the encoding bit rate of the periodic CSI. Therefore, no separateprocessing is required to determine the encoding bit rates.

After the foregoing bit quantity of the periodic CSI is determined, theuser terminal may determine the piece quantity of the periodic CSIaccording to the bit quantity of the periodic CSI. For specificimplementation, refer to descriptions in the foregoing cases, anddetails are not described herein again.

In a fourth case, the first indication information in step 102 mayinclude the information about the quantity of resources that need to beoccupied by the HARQ-ACK information.

For this manner, in step 102, the network device needs to determine aresource quantity corresponding to the information about the quantity ofresources that need to be occupied by the HARQ-ACK information. Thequantity of resources that need to be occupied by the HARQ-ACKinformation is greater than or equal to a resource quantity obtainedaccording to an original bit quantity of the HARQ-ACK information andthe encoding bit rate of the HARQ-ACK information, and the encoding bitrate of the HARQ-ACK information corresponds to a target received biterror rate of the HARQ-ACK information and a channel condition.

During specific implementation, the network device may determine theencoding bit rate of the HARQ-ACK information according to the targetreceived bit error rate of the HARQ-ACK information and the channelcondition. The network device may then determine, according to theoriginal bit quantity of the HARQ-ACK information and the determinedencoding bit rate of the HARQ-ACK information, the quantity of resourcesthat need to be occupied by the HARQ-ACK information. Similar to thesecond case, the network device may further determine the encoding bitrate of the periodic CSI. Details are not described herein again.

Correspondingly, in step 103, the user terminal needs to determine,according to the resource quantity corresponding to the informationabout the quantity of resources that need to be occupied by the HARQ-ACKinformation, the bit quantity or the piece quantity of the periodic CSIthat can be sent on the channel resource. There are also two casesaccording to whether the encoding bit rates are the same or different.

If the encoding bit rate of the HARQ-ACK information is the same as theencoding bit rate of the periodic CSI, the bit quantity of the periodicCSI that can be sent on the channel resource needs to be less than orequal to a difference between the maximum bit quantity of the UCIinformation that can be transmitted on the channel resource and theoriginal bit quantity of the HARQ-ACK information, the maximum bitquantity of the UCI information that can be transmitted on the channelresource corresponds to the encoding bit rate of the HARQ-ACKinformation and a total resource quantity of the channel resource, andthe encoding bit rate of the HARQ-ACK information corresponds to thequantity of resources that need to be occupied by the HARQ-ACKinformation and the original bit quantity of the HARQ-ACK information.

For this case, during specific implementation, the user terminal maydetermine the encoding bit rate of the HARQ-ACK information according tothe quantity of resources that need to be occupied by the HARQ-ACKinformation and the original bit quantity of the HARQ-ACK information.The user terminal may then determine, according to the encoding bit rateof the HARQ-ACK information and the total resource quantity of thechannel resource, the maximum bit quantity of the UCI information thatcan be transmitted on the channel resource. The user terminal may thenobtain, according to the original bit quantity of the HARQ-ACKinformation and the maximum bit quantity, the bit quantity of theperiodic CSI that can be sent on the channel resource.

If the encoding bit rate of the HARQ-ACK information is different fromthe encoding bit rate of the periodic CSI, the bit quantity of theperiodic CSI that can be sent on the channel resource should correspondto a quantity of resources that can be occupied by the periodic CSI andthe encoding bit rate of the CSI, and the quantity of resources that canbe occupied by the periodic CSI is less than or equal to a differencebetween a total resource quantity of the channel resource and thequantity of resources that need to be occupied by the HARQ-ACKinformation.

For this case, during specific implementation, the user terminal maydetermine the encoding bit rate of the HARQ-ACK information according tothe quantity of resources that need to be occupied by the HARQ-ACKinformation and the original bit quantity of the HARQ-ACK information.The user terminal may determine the encoding bit rate of the periodicCSI according to a preset difference between the encoding bit rate ofthe HARQ-ACK information and the encoding bit rate of the periodic CSI.The user terminal may determine, according to the quantity of resourcesthat need to be occupied by the HARQ-ACK information and the totalresource quantity of the channel resource, the quantity of resourcesthat can be occupied by the periodic CSI. The user terminal may thenobtain, according to the quantity of resources that can be occupied bythe periodic CSI and the encoding bit rate of the periodic CSI, the bitquantity of the periodic CSI that can be sent on the channel resource.

In the foregoing two cases, the user terminal can determine the encodingbit rate of the HARQ-ACK information and the encoding bit rate of theperiodic CSI by using the foregoing process.

Similar to the third case, after the foregoing bit quantity of theperiodic CSI is determined, the user terminal may determine the piecequantity of the periodic CSI according to the bit quantity of theperiodic CSI. For specific implementation, refer to descriptions in theforegoing cases, and details are not described herein again.

In a fifth case, the first indication information in step 102 mayinclude the maximum bit quantity information of the UCI information thatcan be transmitted on the channel resource.

For this manner, in step 102, the network device needs to determine themaximum bit quantity corresponding to the maximum bit quantityinformation.

If the encoding bit rate of the HARQ-ACK information is the same as theencoding bit rate of the periodic CSI, the maximum bit quantity of theUCI information that can be transmitted on the channel resource is equalto a bit quantity obtained according to a total resource quantity of thechannel resource and the encoding bit rate of the HARQ-ACK information.The encoding bit rate of the HARQ-ACK information corresponds to atarget received bit error rate of the HARQ-ACK information and a channelcondition.

For this case, during specific implementation, the network device maydetermine the encoding bit rate of the HARQ-ACK information and theencoding bit rate of the periodic CSI according to the target receivedbit error rate of the HARQ-ACK information and the channel condition.The network device may then determine, according to the encoding bitrates and the total resource quantity of the channel resource, themaximum bit quantity of the UCI information that can be transmitted onthe channel resource.

If the encoding bit rate of the HARQ-ACK information is different fromthe encoding bit rate of the periodic CSI, the maximum bit quantity ofthe UCI information that can be transmitted on the channel resource isgreater than or equal to a sum of a bit quantity of the HARQ-ACKinformation and the bit quantity of the periodic CSI that can be sent onthe channel resource, the bit quantity of the periodic CSI that can besent on the channel resource corresponds to the encoding bit rate of theperiodic CSI and a quantity of resources that can be occupied by theperiodic CSI, there is a difference between the encoding bit rate of theperiodic CSI and the encoding bit rate of the HARQ-ACK information, thequantity of resources that can be occupied by the periodic CSI is aresource quantity obtained by subtracting a quantity of resourcesoccupied by the HARQ-ACK information from a total resource quantity ofthe channel resource, the quantity of resources occupied by the HARQ-ACKinformation corresponds to the encoding bit rate of the HARQ-ACKinformation and the bit quantity of the HARQ-ACK information, and theencoding bit rate of the HARQ-ACK information corresponds to a targetreceived bit error rate of the HARQ-ACK information and a channelcondition.

For this case, during specific implementation, the network device mayfirst determine the encoding bit rate of the HARQ-ACK information, wherea specific manner is the same as that described above, and details arenot described herein again. The network device may further determine thequantity of resources occupied by the HARQ-ACK information. The networkdevice may then subtract the quantity of resources occupied by theHARQ-ACK information from the total resource quantity of the channelresource, to obtain the quantity of resources that can be occupied bythe periodic CSI. The network device may then determine the encoding bitrate of the periodic CSI according to the preset difference between theencoding bit rate of the HARQ-ACK information and the encoding bit rateof the periodic CSI. The network device may then finally obtain,according to the encoding bit rate of the periodic CSI and the quantityof resources that can be occupied by the periodic CSI, the bit quantityof the periodic CSI that can be sent on the channel resource. Thenetwork device may ultimately obtain, according to the bit quantity ofthe HARQ-ACK information and the determined bit quantity of the periodicCSI that can be sent, the maximum bit quantity of the UCI informationthat can be transmitted on the channel resource.

Correspondingly, in step 103, the user terminal needs to determine,according to the maximum bit quantity corresponding to the maximum bitquantity information, the bit quantity or the piece quantity of theperiodic CSI that can be sent on the channel resource. The bit quantityof the periodic CSI that can be sent on the channel resource can beobtained by subtracting an original bit quantity of the HARQ-ACKinformation from the maximum bit quantity, and the bit quantity of theperiodic CSI that can be sent on the channel resource may be less thanor equal to a difference between the maximum bit quantity and theoriginal bit quantity of the HARQ-ACK information.

Similar to the foregoing cases, after the foregoing bit quantity of theperiodic CSI is determined, the user terminal may determine the piecequantity of the periodic CSI according to the bit quantity of theperiodic CSI. For specific implementation, refer to descriptions in theforegoing cases, and details are not described herein again.

In step 103, the user terminal may further determine the encoding bitrate of the periodic CSI and the encoding bit rate of the HARQ-ACKinformation according to the maximum bit quantity corresponding to themaximum bit quantity information. There are also two cases according towhether the encoding bit rates are the same or different.

If the encoding bit rate of the HARQ-ACK information is the same as theencoding bit rate of the periodic CSI, the user terminal may determinethe encoding bit rate of the periodic CSI and the encoding bit rate ofthe HARQ-ACK information according to the maximum bit quantity and thetotal resource quantity of the channel resource.

If the encoding bit rate of the HARQ-ACK information is different fromthe encoding bit rate of the periodic CSI, the user terminal maydetermine the respective encoding bit rates of the HARQ-ACK informationand the periodic CSI according to the original bit quantity of theHARQ-ACK information, the bit quantity of the periodic CSI that can besent on the channel resource, the preset difference between the encodingbit rate of the HARQ-ACK and the encoding bit rate of the periodic CSI,and the total resource quantity of the channel resource. For details,refer to descriptions in the first case, and details are not describedherein again.

In a sixth case, the first indication information in step 102 mayinclude the identifier of the channel resource. Generally, there may bemultiple channel resources that can be used by the user terminal toreport UCI information. Therefore, the network device may allocate oneof the channel resources to the user terminal. Formats of the multiplechannel resources may be the same or may be different. Channelcapacities of channel resources of a same format may be the same or maybe different. In this case, different second indication informationusually needs to be configured for the channel resources. The networkdevice may select a channel resource according to an original bitquantity of HARQ-ACK. For example, if the original bit quantity of theHARQ-ACK is relatively large, a channel resource with a relatively largetotal resource quantity is selected. Certainly, selection may beperformed in another manner according to a case such as information thatcurrently needs to be transmitted.

Correspondingly, in step 103, the user terminal may specificallydetermine the second indication information according to the identifierand a specified correspondence. The correspondence may include acorrespondence between the identifier and the second indicationinformation. Alternatively, the correspondence may include an identifierof each channel resource and second indication information of thecorresponding channel resource. The second indication information mayinclude one or any combination of the following: the bit quantityinformation of the periodic CSI, the piece quantity information of theperiodic CSI, the encoding bit rate information of the HARQ-ACKinformation, the information about the quantity of resources that needto be occupied by the HARQ-ACK information, or the maximum bit quantityinformation of the UCI information that can be transmitted on thechannel resource.

For example, there are four channel resources that can be used to sendthe UCI information, the second indication information includes all theforegoing information, and the correspondence includes the identifier ofeach channel resource and the second indication information of thecorresponding channel resource. The correspondence in this case may beshown in Table 1. An identifier 00 corresponds to a first channelresource, an identifier 01 corresponds to a second channel resource, anidentifier 10 corresponds to a third channel resource, and an identifierii corresponds to a fourth channel resource.

TABLE 1 Identifier Second indication information 00 Bit quantityEncoding bit rate Information N_(a3) Maximum bit information N_(a1)information N_(a2) of about a quantity of quantity information ofperiodic CSI HARQ-ACK resources that need N_(a4) of UCI information CSIinformation to be occupied by information that can the HARQ-ACK betransmitted on a information channel resource 1 01 Bit quantity Encodingbit rate Information N_(b3) Maximum bit information N_(b1) informationN_(b2) of about a quantity of quantity information of periodic CSIHARQ-ACK resources that need N_(b4) of UCI information CSI informationto be occupied by information that can the HARQ-ACK be transmitted on ainformation channel resource 2 10 Bit quantity Encoding bit rateInformation N_(c3) Maximum bit information N_(c1) information N_(c2) ofabout a quantity of quantity information of periodic CSI HARQ-ACKresources that need N_(c4) of UCI information CSI information to beoccupied by information that can the HARQ-ACK be transmitted on ainformation channel resource 3 11 Bit quantity Encoding bit rateInformation N_(d3) Maximum bit information N_(d1) information N_(d2) ofabout a quantity of quantity information of periodic CSI HARQ-ACKresources that need N_(d4) of UCI information CSI information to beoccupied by information that can the HARQ-ACK be transmitted on ainformation channel resource 4

The user terminal then determines, according to the second indicationinformation, the bit quantity of the periodic CSI that can be sent onthe channel resource. The user terminal may further determine theencoding bit rate of the HARQ-ACK information and the encoding bit rateof the periodic CSI. For specific implementation, refer to the foregoingdescriptions, and details are not described herein again.

Specific processing in the five cases is described above. A personskilled in the art may readily figure out, by using the foregoing fivecases, specific implementation corresponding to any combination of theforegoing cases. Therefore, various combinations are not described indetail one by one.

The foregoing sixth case relates to multiple channel resources. Multiplechannel resources may also exist in the other cases. Therefore, thenetwork device also needs to select a channel resource. Formats of thechannel resources may include one of the following formats. Certainly,this embodiment of the present invention is not limited to the followingformats.

First format: a physical uplink control channel (PUCCH) format 3.Symbols, obtained after channel coding and modulation are performed onoriginal bits, are separately placed in two timeslots of one subframe.In this way, there are 12 modulation symbols in each timeslot, and the12 modulation symbols are placed on 12 consecutive subcarriers of onetime-domain symbol of the timeslot, that is, occupy 12 subcarriers ofone time-domain symbol in one resource block (RB). Then, spread spectrumis performed for each timeslot in a time domain using an orthogonalcover code (OCC) of a length 5 and by using a sequence w. One timeslotoccupies five time-domain symbols in one RB, different UEs may performcode division multiplexing in one RB by using different OCCs, and twoother symbols are used to carry a reference signal (RS). Then, discreteFourier transform (DFT) precoding and inverse fast Fourier transform(IFFT) are performed after the spread spectrum.

Second format: a first format based on the PUCCH format 3. A channelresource of the PUCCH format 3 is spread, to occupy N(N>1) RBs. Two RBsare used as an example, and each timeslot that occupies 12 subcarriersis spread, so that each timeslot occupies 24 subcarriers. Bits that areobtained after channel coding and scrambling are performed on originalbits are modulated, and then separately placed on each subcarrier of twoRBs in one subframe. Then, spread spectrum is performed for eachtimeslot in a time domain using an orthogonal cover code (OCC) of alength 5 and by using a sequence w. One timeslot occupies fivetime-domain symbols, and two other symbols are used to carry a referencesignal (RS). A mapping location of a demodulation reference signal isthe same as that in the PUCCH format 3. Then, on each symbol, unifiedlength-24 DFT precoding and inverse fast Fourier transform (IFFT) areperformed on data that is in the two RBs and that is obtained after thespread spectrum. A solution to spreading into three or more RBs issimilar, and spreading needs to be performed only in a frequency domain.In addition to RM coding, original bit information of this format may beencoded by using a convolutional code, for example, a tail bitingconvolutional code (TBCC).

Third format: a second format based on the PUCCH format 3. A channelresource occupies N(N>1) RBs, and a format of each RB is the same asthat in the foregoing PUCCH format 3. Two RBs are used as an example,and each timeslot that occupies 12 subcarriers is spread, so that eachtimeslot occupies 24 subcarriers. Bits that are obtained after channelcoding and scrambling are performed on original bits are modulated, andthen separately placed on each subcarrier of two RBs in one subframe.Then, spread spectrum is performed for each timeslot in a time domain byusing an orthogonal cover code (OCC) of a length 5 and using a sequencew. One timeslot occupies five time-domain symbols, and two other symbolsare used to carry a reference signal (RS). A mapping location of ademodulation reference signal is the same as that in the PUCCH format 3.Then, on each symbol, length-12 DFT precoding is performed on data thatis in each of the two RBs and that is obtained after the spreadspectrum. Each DFT precoding result is mapped to a frequency domain forinverse fast Fourier transform, to complete IFFT transform on a carrier.A solution to spreading into three or more RBs is similar, and spreadingneeds to be performed only in a frequency domain. In addition to RMcoding, original bit information of this format may be encoded using aconvolutional code, for example, a tail biting convolutional code(TBCC).

Fourth format: a third format based on the PUCCH format 3. A channelresource occupies N(N≥1) RBs. A possible manner is using a DFT-S-OFDMtransmission mode on the channel resource. Symbols, obtained afterchannel coding and modulation are performed on original bits, areseparately placed on K symbols of one subframe. Spread spectrum isperformed on each of the K symbols in a time domain by using anorthogonal cover code OCC of a length M (M<5), each to-be-sentmodulation symbol occupies M time-domain symbols, and there are also twosymbols in each timeslot that are used to carry a reference signal (RS).A mapping location of a demodulation reference signal is the same asthat in the PUCCH format 3. DFT precoding and inverse fast Fouriertransform (IFFT) are performed after the spread spectrum. Anotherpossible manner is using a DFT-S-OFDM transmission mode on each RBresource of N RBs. Symbols, obtained after channel coding and modulationare performed on original bits, are separately placed on K symbols ofone subframe Spread spectrum is performed on each of the K symbols in atime domain by using an orthogonal cover code OCC of a length M(M<5),each to-be-sent modulation symbol occupies M time-domain symbols, andthere are also two symbols in each timeslot that are used to carry areference signal (RS). A mapping location of a demodulation referencesignal is the same as that in the PUCCH format 3. In addition to RMcoding, original bit information of this format may be encoded by usinga convolutional code, for example, a tail biting convolutional code(TBCC).

Fifth format: a fourth format based on the PUCCH format 3. A channelresource occupies N(N≥1) RBs. A possible manner is using a DFT-S-OFDMtransmission mode on the channel resource. Symbols, obtained afterchannel coding and modulation, are separately placed in two timeslots ofone subframe. P(P≥2) encoded modulation symbols may be placed on eachsymbol. In a time domain, spread spectrum is performed on the P encodedmodulation symbols on each symbol using P different orthogonal covercodes OCCs of a length 5, and P signals obtained after the spreadspectrum are superposed. Each to-be-sent modulation symbol occupies fivetime-domain symbols, and there are also two symbols in each timeslotthat are used to carry a reference signal (RS). A mapping location of ademodulation reference signal is the same as that in the PUCCH format 3.Then, DFT precoding and inverse fast Fourier transform (IFFT) areperformed after the spread spectrum. Another possible manner is using aDFT-S-OFDM transmission mode on each RB resource of N RBs. Original bitsare separately placed in two timeslots of one subframe after channelcoding and modulation. P(P≥2) encoded modulation symbols may be placedon each symbol. In a time domain, spread spectrum is performed on the Pencoded modulation symbols on each symbol using P different orthogonalcover codes OCCs of a length 5, and P signals obtained after the spreadspectrum are superposed. Each to-be-sent modulation symbol occupies fivetime-domain symbols, and there are also two symbols in each timeslotthat are used to carry a reference signal (RS). A mapping location of ademodulation reference signal is the same as that in the PUCCH format 3.In addition to RM coding, original bit information of this format may beencoded using a convolutional code, for example, a tail bitingconvolutional code (TBCC).

Sixth format: a format based on a PUSCH. A channel resource occupiesN(N≥1) RBs. In a normal CP case, a symbol in the middle of each PRB is ademodulation reference signal; and in an extended CP case, a thirdsymbol of each PRB is a demodulation reference signal. Originalinformation that is to be fed back is mapped to locations other than alocation of the demodulation reference signal on a first PUCCH channelresource after channel coding and modulation. Then, DFT precoding andinverse fast Fourier transform (IFFT) are performed. Original bitinformation of this format may be encoded by using a convolutional code,for example, a tail biting convolutional code (TBCC).

In addition, in step 102, when the HARQ-ACK information and the periodicCSI are separately encoded and modulated, the first indicationinformation sent by the network device may further include a modulationscheme of the periodic CSI.

In an embodiment, when a same determined modulation scheme, for example,QPSK, is used for the HARQ-ACK information and the periodic CSI, thereis a one-to-one correspondence between respective encoded bit quantitiesof the HACK-ACK and the periodic CSI and respective quantities ofchannel resources occupied by the HACK-ACK and the periodic CSI. If theencoding bit rate of the periodic CSI is different from the encoding bitrate of the HARQ-ACK, multiple modulation schemes such as 16QAM and64QAM that are different from a modulation scheme of the HARQ-ACK may beused for the periodic CSI. In this case, after determining the encodingbit rate of the periodic CSI, the network device may determine amodulation scheme of the periodic CSI according to the target receivedbit error rate of the CSI, the channel condition, and the encoding bitrate of the periodic CSI. The network device may then send informationabout the determined modulation scheme of the periodic CSI to the UE byusing the first indication information.

Correspondingly, in this embodiment of the present invention, beforesending the periodic CSI in step 104, the UE may further obtain theinformation about the modulation scheme of the periodic CSI using thefirst indication information; determine, according to the modulationscheme, the quantity of resources that can be occupied by the periodicCSI, and the encoding bit rate of the periodic CSI, the bit quantity ofthe periodic CSI that can be sent. The UE may modulate the encodedto-be-sent periodic CSI using the modulation scheme. The UE may thensend, on the channel resource, the periodic CSI corresponding to the atleast one of the multiple downlink carriers.

The foregoing describes some specific implementations of steps 102 and103. The following describes some specific implementations of steps 104and 105.

In step 104, the user terminal needs to determine the to-be-sentperiodic CSI. The bit quantity or the piece quantity that is determinedin step 103 and that is of the periodic CSI that can be sent on thechannel resource is usually less than a bit quantity or a piece quantityof periodic CSI that currently needs to be sent. Therefore, the userterminal needs to select periodic CSI, to determine the to-be-sentperiodic CSI.

A specific selection rule may be as follows. When there is a carriergroup of carriers, a priority of a carrier group with a smaller carriergroup number is higher than that of a carrier group with a largercarrier group number. When all periodic CSI corresponding to the carriergroup with a smaller carrier group number can be transmitted, if thereare still remaining resources, periodic CSI corresponding to the carriergroup with a larger carrier group number is then transmitted. When thereare two carrier groups, a carrier in one carrier group is a carrier forwhich no corresponding HARQ-ACK information currently needs to be sent,and a carrier in the other group has corresponding HARQ-ACK informationthat needs to be sent.

For a same carrier group, a priority of a carrier with a smaller carriersequence number is higher than that of a carrier with a larger carriersequence number.

The user terminal may further determine, according to a priority of theperiodic CSI, periodic CSI to be preferentially sent, for example,determine that periodic CSI that has a high priority in the periodic CSIneeding to be sent and that can meet the bit quantity or the piecequantity of the periodic CSI that can be sent is the to-be-sent periodicCSI. The priority is determined according to a type of the periodic CSIor a carrier sequence number corresponding to the periodic CSI.Alternatively, a priority of each piece of CSI is first determinedaccording to a type of the periodic CSI, and then priorities of CSI of asame type are determined according to priorities of carrier sequencenumbers corresponding to the CSI. A priority of periodic CSIcorresponding to a smaller carrier sequence number is higher than apriority of CSI periodic CSI corresponding to a larger carrier sequencenumber. A rule for determining a priority according to the type of theperiodic CSI is as follows. A priority of periodic CSI including an RIis the highest.

The rule for determining a priority according to the type of theperiodic CSI is as follows: including a rank indication RI>including atleast one of a wideband CQI or a wideband PMI>including at least one ofa subband CQI or a subband PMI.

In this manner, periodic CSI of a more important carrier may bepreferentially sent, so that not only the problem that accuracy inscheduling the user terminal by the base station is affected because theuser terminal cannot report the periodic CSI of all the downlinkcarriers is avoided to the greatest extent possible, but accuracy inscheduling an important carrier of the user terminal by the base stationcan also be ensured to the greatest extent possible.

The foregoing embodiment describes the implementation method. Thefollowing describes the user terminal and the network devicecorresponding to the implementation method.

A user terminal in an embodiment of the present invention is shown inFIG. 2. The user terminal sends HARQ-ACK information and periodic CSIusing a channel resource. A carrier corresponding to the HARQ-ACKinformation and the periodic CSI belongs to multiple downlink carriers.The user terminal may include a receiving unit 201, a processing unit202, and a sending unit 203.

The receiving unit 201 is configured to: receive, using at least one ofthe multiple downlink carriers, downlink data transmitted by a networkdevice, and receive physical layer signaling from the network device.The network-side signaling includes first indication information. Thefirst indication information is the same as that described in theforegoing method embodiment, and is not described in detail hereinagain.

The processing unit 202 is configured to determine, according to thefirst indication information received by the receiving unit, a bitquantity or a piece quantity of periodic CSI that can be sent on thechannel resource. The processing unit 202 is further configured todetermine, according to the bit quantity or the piece quantity of theperiodic CSI that can be sent on the channel resource, to-be-sentperiodic CSI from periodic CSI corresponding to the multiple downlinkcarriers.

The sending unit 203 is configured to send, on the channel resource, theHARQ-ACK information and the to-be-sent periodic CSI that is determinedby the processing unit.

The first indication information may include an identifier of thechannel resource. In this case, as described in the foregoing methodembodiment, the processing unit in the user terminal may determine,according to the identifier and a specified correspondence, secondindication information corresponding to the identifier; and thendetermine, according to the second indication information, the bitquantity of the periodic CSI that can be sent on the channel resource.For specific descriptions of the correspondence and the secondindication information, refer to descriptions in the foregoing methodembodiment. Details are not described herein again.

The first indication information or the second indication informationmay include different information. For the different information, theprocessing unit in the user terminal may perform different processing.

For example, if the first indication information or the secondindication information includes bit quantity information of the periodicCSI, the processing unit may determine, according to the bit quantity,the bit quantity of the periodic CSI that can be sent on the channelresource.

If the first indication information or the second indication informationincludes piece quantity information of the periodic CSI, the processingunit may determine, according to the piece quantity, the bit quantity ofthe periodic CSI that can be sent on the channel resource.

The processing unit may be further configured to determine, according toencoding bit rate information of the HARQ-ACK information, informationabout a quantity of resources that need to be occupied by the HARQ-ACKinformation, maximum bit quantity information of UCI information thatcan be transmitted on the channel resource, or the like, the bitquantity or the piece quantity of the periodic CSI that can be sent onthe channel resource.

The processing unit may further determine an encoding bit rate of theHARQ-ACK information and an encoding bit rate of the periodic CSIaccording to the first indication information or the second indicationinformation.

When the HARQ-ACK information and the periodic CSI are separatelyencoded and modulated, the first indication information further includesa modulation scheme of the periodic CSI. Correspondingly, before theto-be-sent periodic CSI is sent on the channel resource, the processingunit may be further configured to modulate the to-be-sent periodic CSIaccording to the modulation scheme.

For a specific processing method of the processing unit, refer todescriptions in various processing in the foregoing method embodiment.Details are not described herein again.

A network device in an embodiment of the present invention is applicableto a wireless communications system that includes a user terminal. Theuser terminal sends HARQ-ACK information and periodic CSI using achannel resource. A carrier corresponding to the HARQ-ACK informationand the periodic CSI belongs to multiple downlink carriers. As shown inFIG. 3, the network device may include a sending unit 301, configured totransmit downlink data to the user terminal using at least one of themultiple downlink carriers, and send physical layer signaling to theuser terminal, where the physical layer signaling includes indicationinformation determined by a processing unit. The network device may alsoinclude the processing unit 302, configured to determine the indicationinformation, where the indication information includes one or anycombination of the following: bit quantity information of the periodicCSI, piece quantity information of the periodic CSI, encoding bit rateinformation of the HARQ-ACK information, information about a quantity ofresources that need to be occupied by the HARQ-ACK information, maximumbit quantity information of UCI information that can be transmitted onthe channel resource, or an identifier of the channel resource; and areceiving unit 303, configured to receive the periodic CSI and theHARQ-ACK information that are reported by the user terminal.

Content of the indication information determined by the processing unitis the same as that of the first indication information in the foregoingmethod embodiment.

The processing unit determining the indication information may includethe processing unit determining at least one type of information in theindication information. For a specific determining manner, refer todescriptions in the foregoing method embodiment. Details are notdescribed herein again.

The processing unit may further determine an encoding bit rate of theHARQ-ACK information according to a target received bit error rate ofthe HARQ-ACK information and a channel condition. For specificimplementation, refer to descriptions in the foregoing methodembodiment.

Functional units in the embodiments of the present invention may beintegrated into one processing unit, or each of the units may existalone physically, or two or more units may be integrated into one unit.The integrated unit may be implemented in a form of hardware, or may beimplemented in a form of a software functional unit. In addition, in theembodiments of the present invention, a processing unit may be aprocessor, a sending unit may be a transmitter, and a receiving unit maybe a receiver.

When the integrated unit is implemented in the form of a softwarefunctional unit and sold or used as an independent product, theintegrated unit may be stored in a computer-readable storage medium.Based on such an understanding, the technical solutions of the presentinvention essentially, or the part contributing to the prior art, or allor some of the technical solutions may be implemented in the form of asoftware product. The software product is stored in a storage medium andincludes several instructions for instructing a computer device (whichmay be a personal computer, a server, or a network device) to performall or some of the steps of the methods described in the embodiments ofthe present invention. The foregoing storage medium includes: any mediumthat can store program code, such as a USB flash drive, a removable harddisk, a read-only memory (ROM), a random access memory (RAM), a magneticdisk, or an optical disc.

In the several embodiments provided in this application, it should beunderstood that the disclosed system, apparatus, and method may beimplemented in other manners. For example, the described apparatusembodiment is merely an example. For example, the unit division ismerely logical function division and may be other division in actualimplementation. For example, a plurality of units or components may becombined or integrated into another system, or some features may beignored or not performed. In addition, the displayed or discussed mutualcouplings or direct couplings or communication connections may beimplemented by using some interfaces, indirect couplings orcommunication connections between the apparatuses or units, orelectrical connections, mechanical connections, or connections in otherforms.

What is claimed is:
 1. A method, comprising: receiving, by a userterminal, first indication information from a network device, whereinthe first indication information comprises encoding bit rate informationand an identifier of a first channel resource; determining, by the userterminal according to the first indication information, a bit quantityof periodic channel state information (CSI) that can be sent on thefirst channel resource or a piece quantity of periodic CSI that can besent on the first channel resource; wherein the bit quantity of theperiodic CSI that can be sent on the first channel resource is less thanor equal to a bit quantity of periodic CSI that is to be fed back for aplurality of downlink carriers, or the piece quantity of periodic CSIthat can be sent on the first channel resource is less than or equal toa piece quantity of the periodic CSI that is to be fed back for theplurality of downlink carriers; and sending, by the user terminal,Hybrid Automatic-Repeat-Request acknowledgement (HARQ-ACK) informationand periodic CSI using the first channel resource, wherein the periodicCSI corresponds to a carrier of the plurality of downlink carriers, andwherein downlink data corresponding to the HARQ-ACK information isreceived by the user terminal using the carrier of the plurality ofdownlink carriers.
 2. The method according to claim 1, wherein the bitquantity of the periodic CSI that can be sent on the first channelresource is less than or equal to a difference between a maximum bitquantity of uplink control information (UCI) that can be transmitted onthe first channel resource and an original bit quantity of the HARQ-ACKinformation, and the maximum bit quantity of the UCI information thatcan be transmitted on the first channel resource corresponds to theencoding bit rate of the HARQ-ACK information and a total resourcequantity of the first channel resource.
 3. The method according to claim1, wherein the method comprises determining, by the user terminalaccording to the first indication information, the bit quantity ofperiodic CSI that can be sent on the first channel resource.
 4. Themethod according to claim 3, wherein the bit quantity of the periodicCSI that can be sent on the first channel resource is less than or equalto the bit quantity of periodic CSI that is to be fed back for theplurality of downlink carriers.
 5. The method according to claim 1,wherein the method comprises determining, by the user terminal accordingto the first indication information, the piece quantity of periodic CSIthat can be sent on the first channel resource.
 6. The method accordingto claim 5, wherein the piece quantity of periodic CSI that can be senton the first channel resource is less than or equal to the piecequantity of periodic CSI that is to be fed back for the plurality ofdownlink carriers.
 7. A user terminal, comprising: a receiver,configured to: receive first indication information from a networkdevice, wherein the first indication information comprises encoding bitrate information and an identifier of a first channel resource; aprocessor; and a computer-readable storage medium storing a program tobe executed by the processor, the program including instructions for:determining, according to the first indication information received bythe receiver, a bit quantity of periodic channel state information (CSI)that can be sent on the first channel resource or a piece quantity ofperiodic CSI that can be sent on the first channel resource, wherein thebit quantity of the periodic CSI that can be sent on the first channelresource is less than or equal to a bit quantity of periodic CSI that isto be fed back for a plurality of downlink carriers, or the piecequantity of periodic CSI that can be sent on the first channel resourceis less than or equal to a piece quantity of periodic CSI that is to befed back for the plurality of downlink carriers; and a transmitter,configured to send, on the first channel resource, HybridAutomatic-Repeat-Request acknowledgement (HARQ-ACK) information andperiodic CSI that is determined by the processor, wherein the periodicCSI corresponds to a carrier of the plurality of downlink carriers, andwherein downlink data corresponding to the HARQ-ACK information isreceived by the user terminal using the carrier of the plurality ofdownlink carriers.
 8. The user terminal according to claim 7, whereinthe bit quantity of the periodic CSI that can be sent on the firstchannel resource is less than or equal to a difference between a maximumbit quantity of uplink control information (UCI) information that can betransmitted on the first channel resource and an original bit quantityof the HARQ-ACK information, and the maximum bit quantity of the UCIinformation that can be transmitted on the first channel resourcecorresponds to the encoding bit rate of the HARQ-ACK information and atotal resource quantity of the first channel resource.
 9. The userterminal according to claim 8, wherein the program includes instructionsfor determining, according to the first indication information, the bitquantity of periodic CSI that can be sent on the first channel resource.10. The user terminal according to claim 9, wherein the bit quantity ofthe periodic CSI that can be sent on the first channel resource is lessthan or equal to the bit quantity of periodic CSI that is to be fed backfor the plurality of downlink carriers.
 11. The user terminal accordingto claim 8, wherein the program includes instructions for determining,by the user terminal according to the first indication information, thepiece quantity of periodic CSI that can be sent on the first channelresource.
 12. The user terminal according to claim ii, wherein the piecequantity of periodic CSI that can be sent on the first channel resourceis less than or equal to the piece quantity of periodic CSI that is tobe fed back for the plurality of downlink carriers.
 13. A communicationsystem, comprising: a user terminal; and a network device; wherein thenetwork device is configured to send first indication information to theuser terminal, wherein the first indication information comprisesencoding bit rate information and an identifier of a first channelresource; wherein the user terminal is configured to: receive the firstindication information; determine, according to the first indicationinformation, a bit quantity of periodic channel state information (CSI)that can be sent on the first channel resource or a piece quantity ofperiodic CSI that can be sent on the first channel resource, wherein thebit quantity of the periodic CSI that can be sent on the first channelresource is less than or equal to a bit quantity of periodic CSI that isto be fed back for a plurality of downlink carriers, or the piecequantity of periodic CSI that can be sent on the first channel resourceis less than or equal to a piece quantity of the periodic CSI that is tobe fed back for the plurality of downlink carriers; and send HybridAutomatic-Repeat-Request acknowledgement (HARQ-ACK) information andperiodic CSI using the first channel resource; and wherein the networkdevice is further configured to: receive the periodic CSI and theHARQ-ACK information that are sent by the user terminal, wherein theperiodic CSI corresponds to a carrier of the plurality of downlinkcarriers, and wherein downlink data corresponding to the HARQ-ACKinformation is received by the terminal device using the carrier of theplurality of downlink carriers.
 14. The communication system accordingto claim 13, wherein the bit quantity of the periodic CSI that can besent on the first channel resource is less than or equal to a differencebetween a maximum bit quantity of uplink control information (UCI) thatcan be transmitted on the first channel resource and an original bitquantity of the HARQ-ACK information, and the maximum bit quantity ofthe UCI information that can be transmitted on the first channelresource corresponds to the encoding bit rate of the HARQ-ACKinformation and a total resource quantity of the first channel resource.15. The system according to claim 13, wherein the user terminal isconfigured to determine, according to the first indication information,the bit quantity of periodic CSI that can be sent on the first channelresource.
 16. The system according to claim 15, wherein the bit quantityof the periodic CSI that can be sent on the first channel resource isless than or equal to the bit quantity of periodic CSI that is to be fedback for the plurality of downlink carriers.
 17. The system according toclaim 13, wherein the user terminal is configured to determine,according to the first indication information, the piece quantity ofperiodic CSI that can be sent on the first channel resource.
 18. Thesystem according to claim 17, wherein the piece quantity of periodic CSIthat can be sent on the first channel resource is less than or equal tothe piece quantity of periodic CSI that is to be fed back for theplurality of downlink carriers.